Ok how about this one.
Imagine you're playing a game with some fiends on a playground, like superheroes or whatever. Than that one guy comes in and yells " you're not actually real superheroes and you have no super powers " all of a sudden the fun with imagining you do is sucked out.
That's essentially what life would be like forever for children if they lived in a world where falsehood was completely void. Everyone would only play games that are reasonably realistic. No sense in imagining since that'd just be a lie.
That's the world where everyone lives with no concept of deception and lies.
Alternatively and not really relevant, we could end up like those aliens in Galaxy Quest are.
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Brawl is like ZSS' breasts. Well rounded for casual players
http://img.imgcake.com/1319527328883gifad.gif